We have studied eight binary systems comprising three enantiotropic nematogens, namely 4-(4-n-butyloxybenzoyloxy)phenylazo-4-fluorobenzene, 4-(4-n-butyloxybenzo yloxy)benzylidene-4-fluoro aniline, and 4-(4-n-heptyloxybenzoyloxy)phenylazo-4-fl uorobenzene; a monotropic nematogen, viz. 4-(4-n-dodecyloxybenzoyloxy)napthylazo-4-fluorobenzene; and three nonmesogens, viz. 4-(4-n-butyloxy benzoyloxy)benzalde hyde, 4-methoxybenzylidene-4-chloroaniline, and 4-methoxybenzylidene-4-toluidine. The central linkage, terminal group, and central ring system of the components have been varied systematically and the effect of these variations has been evaluated on the liquid crystalline properties of the binary mixtures. The mixed mesomorphic properties of these systems are discussed on the basis of their phase diagrams.